Mailchimp subscription failed

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Hi. I'm trying to get Formplus to work with the Mailchimp integration. I've set the API-key and the List-key, plus "updated" and set the Email parameter on. Still it says that "Subscription failed. Please try again or notify the admin."

In the email received I get a message saying "

Subscription Error from Mailchimp:
The resource submitted could not be validated. For field-specific details, see the 'errors' array.
Error: Invalid Resource
Status: 400
http://developer.mailchimp.com/documentation/mailchimp/guides/error...

In the Mailchimp admin-side this is said about this problem:
InvalidResource

The resource submitted could not be validated.

"For field-specific details, see field_warnings or field_errors objects. This error means that the object submitted to a POST or PATCH request failed to validate against JSON schema, and could relate to campaign, interest group, merge field, or any other available object."

Honestly, this doesn't really help me in any way.

Could you please give a hand with this? Thank you.

Type: Pre-Sale
Status: New
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concrete5 Environment Information

# concrete5 Version
Core Version - 5.7.5.2
Version Installed - 5.7.5.2
Database Version - 20150731000000

# concrete5 Packages
Background Image and Overlay (0.9.5), Form Plus (2.2), Kustom Base (1.1), Vivid Simple Accordion (1.0.1).

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Block Cache - On
Overrides Cache - On
Full Page Caching - Off
Full Page Cache Lifetime - Every 6 hours (default setting).

# Server Software
Apache

# Server API
cgi-fcgi

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5.6.12

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# PHP Settings
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memory_limit - 128M
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soap.wsdl_cache_limit - 5

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Chrome/46.0.2490.86

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